Beans and cornbread or brown rice form a complete amino acid group and can be subbed for meat protein. Quinoa is also a complete protein. Yes, it is a little expensive, so buy a big bag now. I sprinkle it on salads and add it to soups. Don't forget, we can grow things here, even during winter. Carrots, onions, broccoli and cabbage for example.
If you can't grow, or don't can food, dehydrate. Many frozen vegetables can be dehydrated to take up much less space. 3 small bags of corn or soup mix will fit in a pint jar when dried. Dry one, measure to see how much it makes, then you can store larger quantities in a jar and just measure out what you need. If you see something on sale, buy it then, don't wait. The price is not going to come down. If you have a bread machine, this is the time to start using it, but make sure you have a good supply of yeast and flour to work with. Yeast, flour, salt, sugar, and water are all you need to make bread. I store flour in the fridge, or vacuum bags. pasta will keep easily for a year, put it in a jar or seal it in a jar. I know most of you know, meat in smaller amounts, concentrate on vegetables.
I know sometimes I sound like a broken record, but this is how to survive, even as prices go up.